Drill bit



G. G. HARRINGTON 2,046,739

DRILL BIT July 7, 1936.

Filed June 6, 1955 vy fl fi l'm: 17d

INVENTOR.

ATTORNEY. 4 v

Patented July 7, 1936 v 2,046,739

UNITED STATES PATENT OFFICE T mum, BIT

George G. Harrington, Houston, Tern, assignor to Reed Roller Bit Company, Houston, Tex., a corporation of Texas Application June 6, 1933, Serial No. 674,510 13 Claims. (Cl. 255-71) This invention relates generally to deep well embodiment herein disclosed. Various changes drilling apparatus and specifically to roller bits. may be made within the scope of the following It has for its general object the provision of a claims. Of the many changes that may be made new and improved bit having large cutters conas to form without change in substance may be structed and arranged to efiiciently out various mentioned the construction of the cutter M in hard formations. two pieces instead of one as-shown.

A specific object of the invention is to provide I claim: a new and improved bit wherein the cutting 1. A rotary bit comprising a head and a pair of action of spiral cutters can be most efilciently double spiral toothed substantially frusto-coniutilized. cal roller cutters rotatable on axes that are in- Other objects will hereinafter appear. clined upwardly and outwardly in substantially The preferredv embodiment of the invention opposite directions substantially from the longiis illustrated by the accompanying drawing, tudinal axis of said head; said cutters being arwherein Fig. 1 is a sectional elevation of the bit ranged with their base ends outermost; one of and Fig. 2 is a fragmentary elevation thereof. said cutters being arranged to traverse anarea 1 In the drawing the bit head is indicated at i. of substantially circular outline and of a radius It has a threaded socket 2 for the reception of extending from the longitudinal axis of said the conventional drill stem (not shown), by 'head to a point beyond the periphery of said which the bit is rotated. Water is supplied to the head; and the other of said cutters being arcutters through the opening 3 in the head. The ranged to traverse an annular area of a width bit head has a pair of depending bearing proextending from a point substantially midway bejections i and 5 provided with downwardly opentween the longitudinal axis of said head and the ing slots 6 and i for the reception of the cutter periphery of said head to a point beyond the pins 8 and 9. The cutter pin 8 extends to a poperiphery of said head; said cutters having a sition slightly past the longitudinal axis of the plurality of substantially longitudinal grooves head i and is"inwardly stepped as indicated at extending substantially from end to end through it. It is to be understood that the cutter pin d the teeth thereof. may terminate in any expedient position desired 2. A rotary bit comprising a head and a pair j cent the longitudinal axis of the h a, of multiple spiral toothed substantially frusto- The inner ends of the pins 8 d v9 are connected conical roller cutters rotatable on axes that are and spaced by the means indicated at H, which inclined upwardly and outwardly in substantially includes an arm which may be integral with the opposite directi ns su stan ially fr m he lon ipin 9, and a removable ring l2 fitted on the lug tudinal axis of said head; said cutters being ariii of the arm ii and surrounding the inner and ranged with their base ends outermost; one of of the pin 8. Upon the pins 3 and 9 are substansaid cutters being arranged to traverse an area tially frusto-conical spiral cutters. i4 and i5, arof substantially circular outline and of a radius ranged with their base ends outermost. The extending from the longitudinal axis of said head cutters have longitudinal grooves l6 and H e to a p t b y 1216 periphery of Said a tending through the teeth is d I9, Between and the other of said cutters being arranged to the cutters i i and i5 and the bearings adj t traverse an annular area of a width extending thereto may be interposed bearing washers gm from a point substantially midway between the and ii. longitudinal axis of said head and the periphery The cutter pins and washers may be insert d of said head to a point beyond the periphery of n the bit head i as a unit and the ends of the sa d head; sa d utt s havin a plurality of pins 8 and 9 may then be secured in th 1 m a substantially longitudinal grooves extending and i by welding. substantially from end to end through the teeth It will be observed that the cutters are large so thereofthat the bearings therefor may also be made A rotary bit Comprising a head and P large and strong; that the area of contact heo mu p Spiral tOOthEd Substantially fI'lIStO- tween the cutters and the formation is relatively Conical I'C rotatable 011 axes that are small but the cutters are arranged so that toncl n d upw y a ou w y su gether they traverse an area equal to the area of opposite directions substantially from the longithe head. The advantages of these features will tudinal axis of said head; said cutters being ar-' be apparent to those skilled in the art. ranged with their base ends outermost; one of The invention is not limited to the specific said cutters being arran ed to t av 1 r a positely disposed 2 of substantially circular outline and of a radius extending from the longitudinal axis of said head to a point beyond the periphery of said head; and the other of said cutters being arranged to traverse an annular area of a width extending from a point substantially midway between the longitudinal axis of said head and the periphery of said head to a point beyond the periphery of said head.

4. A rotary bit comprising a head and a pair of spiral toothed roller cutters rotatable on axes that are inclined upwardly and outwardly in substantially opposite directions substantially from the longitudinal axis of said head; one of said cutters being arranged to traverse an area of substantially circular outlineand of a radius extending from the longitudinal axis of said head to a point beyond the periphery of said head; and the other of said cutters being arranged to traverse an annular area of a width extending from a point substantially midway between the longitudinal axis of said head and the periphery of tially longitudinal grooves extending ly from end to end through the teeth thereof.

5. A rotary bit comprising a head and a pair of spiral roller cutters rotatable on axes that are inclined upwardly and outwardly in substantially opposite directions substantially from the longitudinal axis of said head; one of said cutters being arranged to traverse an area of substantially circular outline and of a radius extending from the longitudinal axis of said head to a point beyond the periphery of said head; and the other of said cutters being arranged to traverse an annular area of a width extending from a point substantially midway between the longitudinal axis of said head and the periphery of said head to a point beyond the periphery of said head.

6. A rotary bit comprising a head having oppositely disposed depending projections; a pair of cutter pins supported by said projections and extending inwardly and downwardly therefrom substantially toward the longitudinal axis of said head; one of said pins extending substantially to the longitudinal axis of said head; means to connect and space the inner ends of said pins; and a substantially frusto-conical spiral cutter on each of said pins; said cutters being arranged with their base ends outermost to traverse an area substantially equal to the transverse area of said head.

7. A rotary bit comprising a head having opdepending projections; a pair of cutter pins supported by said projections and extending inwardly and downwardly therefrom substantially toward the longitudinal axis of said head; one of said pins extending substantially to the longitudinal axis of said head; means to connect and space the inner ends of said pins; and a spiral cutter on each of said pins; said cutters being arranged to traverse an area substantially equal to the transverse area of said head.

8. A rotary bit comprising a head having oppositely disposed depending projections; a pair of pins extending from said projections downwardly and inwardly substantially toward the longitudinal axis of said head; one of said pins having an arm; and a ring on said arm and en- 5 gaging the other of said pins to hold and space the adjacent ends of said pins; and roller cutters on said pins.

9. A rotary bit comprising a head, and a pair of spiral roller cutters mounted on said head, said cutters being on opposite sides of the longitudinal axis of said head and of unequal extent; one of said cutters having a right-hand spiral and the other of the said cutters having a left-hand spiral.

10. A rotary bit comprising a head, and a pair of spiral toothed roller cutters rotatable on axes that are inclined upwardly and outwardly from the longitudinal axis of said head; one of said cutters having a right-hand spiral and the other of said cutters having a left-hand spiral, said cutters having substantially longitudinal grooves extending through the teeth thereof.

11. A rotary bit comprising a head and a pair of spiral roller cutters rotatable on axes that are 25 inclined upwardly and outwardly in substantially opposite directions substantially from the longitudinal axis of said head; one of said cutters being arranged to traverse an area substantially from the longitudinal-axis of said head to a point beyond the periphery of said head; and the other of said cutters being arranged to traverse an area substantially from a point midway between the longitudinal axis of said head and the periphery of said head to a point beyond the periphery of said head; one of said cutters having a right-hand spiral and the other of said cutters having a left-hand spiral;

12. A rotary bit comprising a head and apair of double spiral toothed substantially frusto-conical roller cutters rotatable on axes that are in clined upwardly and outwardly in substantially opposite directions substantially from the longitudinal axis of said head; said cutters being arranged with their base ends outermost; one of said cutters being arranged to traverse an area substantially from a point midway between the longitudinal axis of said head and the periphery of said head to a point beyond the periphery of said head; said cutters having a plurality of substantially longitudinal grooves extending substantially from end to end through the teeth thereof; one of said cutters having a right-hand spiral and the other of said cutters having a left-hand spiral. 55

13. A rotary bit comprising a head having oppositely disposed depending projections; 21. pair of pins extending from said projections downwardly and inwardly substantially toward the longitudinal axis of said head; separate means on one of said pins forming a depression receiving the other of said pins to hold in proper relative position the adjacent ends of said pins, and roller cutters on said pins.

GEORGE G. HARRINGTON. 35 

